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// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./LPToken.sol";

/**
 * StableSwap main algorithm
 */
library StableSwapStorage {
    using SafeERC20 for IERC20;

    event AddLiquidity(
        address indexed provider,
        uint256[] token_amounts,
        uint256[] fees,
        uint256 invariant,
        uint256 token_supply
    );

    event TokenExchange(
        address indexed buyer,
        uint256 sold_id,
        uint256 tokens_sold,
        uint256 bought_id,
        uint256 tokens_bought
    );

    event RemoveLiquidity(address indexed provider, uint256[] token_amounts, uint256[] fees, uint256 token_supply);

    event RemoveLiquidityOne(address indexed provider, uint256 index, uint256 token_amount, uint256 coin_amount);

    event RemoveLiquidityImbalance(
        address indexed provider,
        uint256[] token_amounts,
        uint256[] fees,
        uint256 invariant,
        uint256 token_supply
    );

    uint256 public constant FEE_DENOMINATOR = 1e10;
    // uint256 public constant PRECISION = 1e18;

    /// @dev protect from division loss when run approximation loop. We cannot divide at the end because of overflow,
    /// so we add some (small) PRECISION when divide in each iteration
    uint256 public constant A_PRECISION = 100;
    /// @dev max iteration of converge calccuate
    uint256 internal constant MAX_ITERATION = 256;
    uint256 public constant POOL_TOKEN_COMMON_DECIMALS = 18;

    struct SwapStorage {
        IERC20[] pooledTokens;
        LPToken lpToken;
        /// @dev token i multiplier to reach POOL_TOKEN_COMMON_DECIMALS
        uint256[] tokenMultipliers;
        /// @dev effective balance which might different from token balance of the contract 'cause it hold admin fee as well
        uint256[] balances;
        /// @dev swap fee ratio. Charge on any action which move balance state far from the ideal state
        uint256 fee;
        /// @dev admin fee in ratio of swap fee.
        uint256 adminFee;
        /// @dev observation of A, multiplied with A_PRECISION
        uint256 initialA;
        uint256 futureA;
        uint256 initialATime;
        uint256 futureATime;
    }

    /**
     * @notice Deposit coins into the pool
     * @param amounts List of amounts of coins to deposit
     * @param minMintAmount Minimum amount of LP tokens to mint from the deposit
     * @return mintAmount Amount of LP tokens received by depositing
     */
    function addLiquidity(
        SwapStorage storage self,
        uint256[] memory amounts,
        uint256 minMintAmount
    ) external returns (uint256 mintAmount) {
        uint256 nCoins = self.pooledTokens.length;
        require(amounts.length == nCoins, "invalidAmountsLength");
        uint256[] memory fees = new uint256[](nCoins);
        uint256 _fee = _feePerToken(self);

        uint256 tokenSupply = self.lpToken.totalSupply();
        uint256 amp = _getAPrecise(self);

        uint256 D0 = 0;
        if (tokenSupply > 0) {
            D0 = _getD(_xp(self.balances, self.tokenMultipliers), amp);
        }

        uint256[] memory newBalances = self.balances;

        for (uint256 i = 0; i < nCoins; i++) {
            if (tokenSupply == 0) {
                require(amounts[i] > 0, "initialDepositRequireAllTokens");
            }
            // get real transfer in amount
            newBalances[i] += _doTransferIn(self.pooledTokens[i], amounts[i]);
        }

        uint256 D1 = _getD(_xp(newBalances, self.tokenMultipliers), amp);
        assert(D1 > D0); // double check

        if (tokenSupply == 0) {
            self.balances = newBalances;
            mintAmount = D1;
        } else {
            uint256 diff = 0;
            for (uint256 i = 0; i < nCoins; i++) {
                diff = _distance((D1 * self.balances[i]) / D0, newBalances[i]);
                fees[i] = (_fee * diff) / FEE_DENOMINATOR;
                self.balances[i] = newBalances[i] - ((fees[i] * self.adminFee) / FEE_DENOMINATOR);
                newBalances[i] -= fees[i];
            }
            D1 = _getD(_xp(newBalances, self.tokenMultipliers), amp);
            mintAmount = (tokenSupply * (D1 - D0)) / D0;
        }

        require(mintAmount >= minMintAmount, "> slippage");

        self.lpToken.mint(msg.sender, mintAmount);
        emit AddLiquidity(msg.sender, amounts, fees, D1, mintAmount);
    }

    function swap(
        SwapStorage storage self,
        uint256 i,
        uint256 j,
        uint256 inAmount,
        uint256 minOutAmount
    ) external returns (uint256) {
        IERC20 inCoin = self.pooledTokens[i];
        uint256[] memory normalizedBalances = _xp(self);
        inAmount = _doTransferIn(inCoin, inAmount);

        uint256 x = normalizedBalances[i] + (inAmount * self.tokenMultipliers[i]);
        uint256 y = _getY(self, i, j, x, normalizedBalances);

        uint256 dy = normalizedBalances[j] - y - 1; // iliminate rouding errors
        uint256 dy_fee = (dy * self.fee) / FEE_DENOMINATOR;

        dy = (dy - dy_fee) / self.tokenMultipliers[j]; // denormalize

        require(dy >= minOutAmount, "> slippage");

        uint256 _adminFee = (dy_fee * self.adminFee) / FEE_DENOMINATOR / self.tokenMultipliers[j];

        // update balances
        self.balances[i] += inAmount;
        self.balances[j] -= dy + _adminFee;

        self.pooledTokens[j].safeTransfer(msg.sender, dy);
        emit TokenExchange(msg.sender, i, inAmount, j, dy);
        return dy;
    }

    function removeLiquidity(
        SwapStorage storage self,
        uint256 lpAmount,
        uint256[] memory minAmounts
    ) external returns (uint256[] memory amounts) {
        uint256 totalSupply = self.lpToken.totalSupply();
        require(lpAmount <= totalSupply);
        uint256 nCoins = self.pooledTokens.length;

        uint256[] memory fees = new uint256[](nCoins);
        amounts = _calculateRemoveLiquidity(self, lpAmount);

        for (uint256 i = 0; i < amounts.length; i++) {
            require(amounts[i] >= minAmounts[i], "> slippage");
            self.balances[i] = self.balances[i] - amounts[i];
            self.pooledTokens[i].safeTransfer(msg.sender, amounts[i]);
        }

        self.lpToken.burnFrom(msg.sender, lpAmount);
        emit RemoveLiquidity(msg.sender, amounts, fees, totalSupply - lpAmount);
    }

    function removeLiquidityOneToken(
        SwapStorage storage self,
        uint256 lpAmount,
        uint256 index,
        uint256 minAmount
    ) external returns (uint256) {
        uint256 totalSupply = self.lpToken.totalSupply();
        require(totalSupply > 0, "totalSupply = 0");
        uint256 numTokens = self.pooledTokens.length;
        require(lpAmount <= self.lpToken.balanceOf(msg.sender), "> balance");
        require(lpAmount <= totalSupply, "> totalSupply");
        require(index < numTokens, "tokenNotFound");

        uint256 dyFee;
        uint256 dy;

        (dy, dyFee) = _calculateRemoveLiquidityOneToken(self, lpAmount, index);

        require(dy >= minAmount, "> slippage");

        self.balances[index] -= (dy + (dyFee * self.adminFee) / FEE_DENOMINATOR);
        self.lpToken.burnFrom(msg.sender, lpAmount);
        self.pooledTokens[index].safeTransfer(msg.sender, dy);

        emit RemoveLiquidityOne(msg.sender, index, lpAmount, dy);

        return dy;
    }

    function removeLiquidityImbalance(
        SwapStorage storage self,
        uint256[] memory amounts,
        uint256 maxBurnAmount
    ) external returns (uint256 burnAmount) {
        uint256 nCoins = self.pooledTokens.length;
        require(amounts.length == nCoins, "invalidAmountsLength");
        uint256 totalSupply = self.lpToken.totalSupply();
        require(totalSupply != 0, "totalSupply = 0");
        uint256 _fee = _feePerToken(self);
        uint256 amp = _getAPrecise(self);

        uint256[] memory newBalances = self.balances;
        uint256 D0 = _getD(_xp(self), amp);

        for (uint256 i = 0; i < nCoins; i++) {
            newBalances[i] -= amounts[i];
        }

        uint256 D1 = _getD(_xp(newBalances, self.tokenMultipliers), amp);
        uint256[] memory fees = new uint256[](nCoins);

        for (uint256 i = 0; i < nCoins; i++) {
            uint256 idealBalance = (D1 * self.balances[i]) / D0;
            uint256 diff = _distance(newBalances[i], idealBalance);
            fees[i] = (_fee * diff) / FEE_DENOMINATOR;
            self.balances[i] = newBalances[i] - ((fees[i] * self.adminFee) / FEE_DENOMINATOR);
            newBalances[i] -= fees[i];
        }

        // recalculate invariant with fee charged balances
        D1 = _getD(_xp(newBalances, self.tokenMultipliers), amp);
        burnAmount = ((D0 - D1) * totalSupply) / D0;
        assert(burnAmount > 0);
        require(burnAmount <= maxBurnAmount, "> slippage");

        self.lpToken.burnFrom(msg.sender, burnAmount);

        for (uint256 i = 0; i < nCoins; i++) {
            if (amounts[i] != 0) {
                self.pooledTokens[i].safeTransfer(msg.sender, amounts[i]);
            }
        }

        emit RemoveLiquidityImbalance(msg.sender, amounts, fees, D1, totalSupply - burnAmount);
    }

    /// VIEW FUNCTIONS
    function getAPrecise(SwapStorage storage self) external view returns (uint256) {
        return _getAPrecise(self);
    }

    /**
     * Returns portfolio virtual price (for calculating profit)
     * scaled up by 1e18
     */
    function getVirtualPrice(SwapStorage storage self) external view returns (uint256) {
        uint256 D = _getD(_xp(self), _getAPrecise(self));
        uint256 tokenSupply = self.lpToken.totalSupply();
        return (D * 10**POOL_TOKEN_COMMON_DECIMALS) / tokenSupply;
    }

    function getAdminBalance(SwapStorage storage self, uint256 index) external view returns (uint256) {
        require(index < self.pooledTokens.length, "indexOutOfRange");
        return self.pooledTokens[index].balanceOf(address(this)) - (self.balances[index]);
    }

    /**
     * Estimate amount of LP token minted or burned at deposit or withdrawal
     * without taking fees into account
     */
    function calculateTokenAmount(
        SwapStorage storage self,
        uint256[] memory amounts,
        bool deposit
    ) external view returns (uint256) {
        uint256 nCoins = self.pooledTokens.length;
        require(amounts.length == nCoins, "invalidAmountsLength");
        uint256 amp = _getAPrecise(self);
        uint256 D0 = _getD(_xp(self), amp);

        uint256[] memory newBalances = self.balances;
        for (uint256 i = 0; i < nCoins; i++) {
            if (deposit) {
                newBalances[i] += amounts[i];
            } else {
                newBalances[i] -= amounts[i];
            }
        }

        uint256 D1 = _getD(_xp(newBalances, self.tokenMultipliers), amp);
        uint256 totalSupply = self.lpToken.totalSupply();

        if (totalSupply == 0) {
            return D1; // first depositor take it all
        }

        uint256 diff = deposit ? D1 - D0 : D0 - D1;
        return (diff * self.lpToken.totalSupply()) / D0;
    }

    function getA(SwapStorage storage self) external view returns (uint256) {
        return _getAPrecise(self) / A_PRECISION;
    }

    function calculateSwap(
        SwapStorage storage self,
        uint256 inIndex,
        uint256 outIndex,
        uint256 inAmount
    ) external view returns (uint256) {
        uint256[] memory normalizedBalances = _xp(self);
        uint256 newInBalance = normalizedBalances[inIndex] + (inAmount * self.tokenMultipliers[inIndex]);
        uint256 outBalance = _getY(self, inIndex, outIndex, newInBalance, normalizedBalances);
        uint256 outAmount = (normalizedBalances[outIndex] - outBalance - 1) / self.tokenMultipliers[outIndex];
        uint256 _fee = (self.fee * outAmount) / FEE_DENOMINATOR;
        return outAmount - _fee;
    }

    function calculateRemoveLiquidity(SwapStorage storage self, uint256 amount)
        external
        view
        returns (uint256[] memory)
    {
        return _calculateRemoveLiquidity(self, amount);
    }

    function calculateRemoveLiquidityOneToken(
        SwapStorage storage self,
        uint256 lpAmount,
        uint256 tokenIndex
    ) external view returns (uint256 amount) {
        (amount, ) = _calculateRemoveLiquidityOneToken(self, lpAmount, tokenIndex);
    }

    /// INTERNAL FUNCTIONS

    /**
     * Ramping A up or down, return A with precision of A_PRECISION
     */
    function _getAPrecise(SwapStorage storage self) internal view returns (uint256) {
        if (block.timestamp >= self.futureATime) {
            return self.futureA;
        }

        if (self.futureA > self.initialA) {
            return
                self.initialA +
                ((self.futureA - self.initialA) * (block.timestamp - self.initialATime)) /
                (self.futureATime - self.initialATime);
        }

        return
            self.initialA -
            ((self.initialA - self.futureA) * (block.timestamp - self.initialATime)) /
            (self.futureATime - self.initialATime);
    }

    /**
     * normalized balances of each tokens.
     */
    function _xp(uint256[] memory balances, uint256[] memory rates) internal pure returns (uint256[] memory) {
        for (uint256 i = 0; i < balances.length; i++) {
            rates[i] = (rates[i] * balances[i]);
        }

        return rates;
    }

    function _xp(SwapStorage storage self) internal view returns (uint256[] memory) {
        return _xp(self.balances, self.tokenMultipliers);
    }

    /**
     * Calculate D for *NORMALIZED* balances of each tokens
     * @param xp normalized balances of token
     */
    function _getD(uint256[] memory xp, uint256 amp) internal pure returns (uint256) {
        uint256 nCoins = xp.length;
        uint256 sum = _sumOf(xp);
        if (sum == 0) {
            return 0;
        }

        uint256 Dprev = 0;
        uint256 D = sum;
        uint256 Ann = amp * nCoins;

        for (uint256 i = 0; i < MAX_ITERATION; i++) {
            uint256 D_P = D;
            for (uint256 j = 0; j < xp.length; j++) {
                D_P = (D_P * D) / (xp[j] * nCoins);
            }
            Dprev = D;
            D =
                (((Ann * sum) / A_PRECISION + D_P * nCoins) * D) /
                (((Ann - A_PRECISION) * D) / A_PRECISION + (nCoins + 1) * D_P);
            if (_distance(D, Dprev) <= 1) {
                return D;
            }
        }

        // Convergence should occur in 4 loops or less. If this is reached, there may be something wrong
        // with the pool. If this were to occur repeatedly, LPs should withdraw via `removeLiquidity()`
        // function which does not rely on D.
        revert("invariantCalculationFailed");
    }

    /**
     * calculate new balance of when swap
     * Done by solving quadratic equation iteratively.
     *  x_1**2 + x_1 * (sum' - (A*n**n - 1) * D / (A * n**n)) = D ** (n + 1) / (n ** (2 * n) * prod' * A)
     *  x_1**2 + b*x_1 = c
     *  x_1 = (x_1**2 + c) / (2*x_1 + b)
     * @param inIndex index of token to swap in
     * @param outIndex index of token to swap out
     * @param inBalance new balance (normalized) of input token if the swap success
     * @return NORMALIZED balance of output token if the swap success
     */
    function _getY(
        SwapStorage storage self,
        uint256 inIndex,
        uint256 outIndex,
        uint256 inBalance,
        uint256[] memory normalizedBalances
    ) internal view returns (uint256) {
        require(inIndex != outIndex, "sameToken");
        uint256 nCoins = self.pooledTokens.length;
        require(inIndex < nCoins && outIndex < nCoins, "indexOutOfRange");

        uint256 amp = _getAPrecise(self);
        uint256 Ann = amp * nCoins;
        uint256 D = _getD(normalizedBalances, amp);

        uint256 sum = 0; // sum of new balances except output token
        uint256 c = D;
        for (uint256 i = 0; i < nCoins; i++) {
            if (i == outIndex) {
                continue;
            }

            uint256 x = i == inIndex ? inBalance : normalizedBalances[i];
            sum += x;
            c = (c * D) / (x * nCoins);
        }

        c = (c * D * A_PRECISION) / (Ann * nCoins);
        uint256 b = sum + (D * A_PRECISION) / Ann;

        uint256 lastY = 0;
        uint256 y = D;

        for (uint256 index = 0; index < MAX_ITERATION; index++) {
            lastY = y;
            y = (y * y + c) / (2 * y + b - D);
            if (_distance(lastY, y) <= 1) {
                return y;
            }
        }

        revert("yCalculationFailed");
    }

    function _calculateRemoveLiquidity(SwapStorage storage self, uint256 amount)
        internal
        view
        returns (uint256[] memory)
    {
        uint256 totalSupply = self.lpToken.totalSupply();
        require(amount <= totalSupply, "Cannot exceed total supply");

        uint256[] memory amounts = new uint256[](self.pooledTokens.length);

        for (uint256 i = 0; i < self.pooledTokens.length; i++) {
            amounts[i] = (self.balances[i] * (amount)) / (totalSupply);
        }
        return amounts;
    }

    function _calculateRemoveLiquidityOneToken(
        SwapStorage storage self,
        uint256 tokenAmount,
        uint256 index
    ) internal view returns (uint256 dy, uint256 fee) {
        require(index < self.pooledTokens.length, "indexOutOfRange");
        uint256 amp = _getAPrecise(self);
        uint256[] memory xp = _xp(self);
        uint256 D0 = _getD(xp, amp);
        uint256 D1 = D0 - (tokenAmount * D0) / self.lpToken.totalSupply();
        uint256 newY = _getYD(self, amp, index, xp, D1);
        uint256[] memory reducedXP = xp;
        uint256 _fee = _feePerToken(self);

        for (uint256 i = 0; i < self.pooledTokens.length; i++) {
            uint256 expectedDx = 0;
            if (i == index) {
                expectedDx = (xp[i] * D1) / D0 - newY;
            } else {
                expectedDx = xp[i] - (xp[i] * D1) / D0;
            }
            reducedXP[i] -= (_fee * expectedDx) / FEE_DENOMINATOR;
        }

        dy = reducedXP[index] - _getYD(self, amp, index, reducedXP, D1);
        dy = (dy - 1) / self.tokenMultipliers[index];
        fee = ((xp[index] - newY) / self.tokenMultipliers[index]) - dy;
    }

    function _feePerToken(SwapStorage storage self) internal view returns (uint256) {
        uint256 nCoins = self.pooledTokens.length;
        return (self.fee * nCoins) / (4 * (nCoins - 1));
    }

    function _getYD(
        SwapStorage storage self,
        uint256 A,
        uint256 index,
        uint256[] memory xp,
        uint256 D
    ) internal view returns (uint256) {
        uint256 nCoins = self.pooledTokens.length;
        assert(index < nCoins);
        uint256 Ann = A * nCoins;
        uint256 c = D;
        uint256 s = 0;
        uint256 _x = 0;
        uint256 yPrev = 0;

        for (uint256 i = 0; i < nCoins; i++) {
            if (i == index) {
                continue;
            }
            _x = xp[i];
            s += _x;
            c = (c * D) / (_x * nCoins);
        }

        c = (c * D * A_PRECISION) / (Ann * nCoins);
        uint256 b = s + (D * A_PRECISION) / Ann;
        uint256 y = D;

        for (uint256 i = 0; i < MAX_ITERATION; i++) {
            yPrev = y;
            y = (y * y + c) / (2 * y + b - D);
            if (_distance(yPrev, y) <= 1) {
                return y;
            }
        }
        revert("invariantCalculationFailed");
    }

    function _doTransferIn(IERC20 token, uint256 amount) internal returns (uint256) {
        uint256 priorBalance = token.balanceOf(address(this));
        token.safeTransferFrom(msg.sender, address(this), amount);
        return token.balanceOf(address(this)) - priorBalance;
    }

    function _sumOf(uint256[] memory x) internal pure returns (uint256 sum) {
        sum = 0;
        for (uint256 i = 0; i < x.length; i++) {
            sum += x[i];
        }
    }

    function _distance(uint256 x, uint256 y) internal pure returns (uint256) {
        return x > y ? x - y : y - x;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IStableSwap {
    /// EVENTS
    event AddLiquidity(
        address indexed provider,
        uint256[] tokenAmounts,
        uint256[] fees,
        uint256 invariant,
        uint256 tokenSupply
    );

    event TokenExchange(
        address indexed buyer,
        uint256 soldId,
        uint256 tokensSold,
        uint256 boughtId,
        uint256 tokensBought
    );

    event RemoveLiquidity(address indexed provider, uint256[] tokenAmounts, uint256[] fees, uint256 tokenSupply);

    event RemoveLiquidityOne(address indexed provider, uint256 tokenIndex, uint256 tokenAmount, uint256 coinAmount);

    event RemoveLiquidityImbalance(
        address indexed provider,
        uint256[] tokenAmounts,
        uint256[] fees,
        uint256 invariant,
        uint256 tokenSupply
    );

    event RampA(uint256 oldA, uint256 newA, uint256 initialTime, uint256 futureTime);

    event StopRampA(uint256 A, uint256 timestamp);

    event NewFee(uint256 fee, uint256 adminFee);

    event CollectProtocolFee(address token, uint256 amount);

    event FeeControllerChanged(address newController);

    event FeeDistributorChanged(address newController);

    // pool data view functions
    function getLpToken() external view returns (IERC20 lpToken);

    function getA() external view returns (uint256);

    function getAPrecise() external view returns (uint256);

    function getToken(uint8 index) external view returns (IERC20);

    function getTokens() external view returns (IERC20[] memory);

    function getTokenIndex(address tokenAddress) external view returns (uint8);

    function getTokenBalance(uint8 index) external view returns (uint256);

    function getTokenBalances() external view returns (uint256[] memory);

    function getNumberOfTokens() external view returns (uint256);

    function getVirtualPrice() external view returns (uint256);

    function calculateTokenAmount(uint256[] calldata amounts, bool deposit) external view returns (uint256);

    function calculateSwap(
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx
    ) external view returns (uint256);

    function calculateRemoveLiquidity(uint256 amount) external view returns (uint256[] memory);

    function calculateRemoveLiquidityOneToken(uint256 tokenAmount, uint8 tokenIndex)
        external
        view
        returns (uint256 availableTokenAmount);

    function getAdminBalances() external view returns (uint256[] memory adminBalances);

    function getAdminBalance(uint8 index) external view returns (uint256);

    // state modifying functions
    function swap(
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx,
        uint256 minDy,
        uint256 deadline
    ) external returns (uint256);

    function addLiquidity(
        uint256[] calldata amounts,
        uint256 minToMint,
        uint256 deadline
    ) external returns (uint256);

    function removeLiquidity(
        uint256 amount,
        uint256[] calldata minAmounts,
        uint256 deadline
    ) external returns (uint256[] memory);

    function removeLiquidityOneToken(
        uint256 tokenAmount,
        uint8 tokenIndex,
        uint256 minAmount,
        uint256 deadline
    ) external returns (uint256);

    function removeLiquidityImbalance(
        uint256[] calldata amounts,
        uint256 maxBurnAmount,
        uint256 deadline
    ) external returns (uint256);

    function withdrawAdminFee() external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "../interfaces/IStableSwap.sol";

contract LPToken is Ownable, ERC20Burnable {
    IStableSwap public swap;

    constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) {
        swap = IStableSwap(msg.sender);
    }

    function mint(address _to, uint256 _amount) external onlyOwner {
        require(_amount > 0, "zeroMintAmount");
        _mint(_to, _amount);
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"provider","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"token_amounts","type":"uint256[]"},{"indexed":false,"internalType":"uint256[]","name":"fees","type":"uint256[]"},{"indexed":false,"internalType":"uint256","name":"invariant","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"token_supply","type":"uint256"}],"name":"AddLiquidity","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"provider","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"token_amounts","type":"uint256[]"},{"indexed":false,"internalType":"uint256[]","name":"fees","type":"uint256[]"},{"indexed":false,"internalType":"uint256","name":"token_supply","type":"uint256"}],"name":"RemoveLiquidity","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"provider","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"token_amounts","type":"uint256[]"},{"indexed":false,"internalType":"uint256[]","name":"fees","type":"uint256[]"},{"indexed":false,"internalType":"uint256","name":"invariant","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"token_supply","type":"uint256"}],"name":"RemoveLiquidityImbalance","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"provider","type":"address"},{"indexed":false,"internalType":"uint256","name":"index","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"token_amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"coin_amount","type":"uint256"}],"name":"RemoveLiquidityOne","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"buyer","type":"address"},{"indexed":false,"internalType":"uint256","name":"sold_id","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"tokens_sold","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"bought_id","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"tokens_bought","type":"uint256"}],"name":"TokenExchange","type":"event"},{"inputs":[],"name":"A_PRECISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FEE_DENOMINATOR","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"POOL_TOKEN_COMMON_DECIMALS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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